docs: def add_option(self, key, default=NO_VALUE, alternate_keys=NO_VALUE,
                     doc='', parser=str, **meta):
          """Add an option to the group.
  
          :arg key: the key to look up
  
          :arg default: the default value (if any); must be a string that is
              parseable by the specified parser
  
          :arg alternate_keys: the list of alternate keys to look up;
              supports a ``root:`` key prefix which will cause this to look at
              the configuration root rather than the current namespace
  
          :arg doc: documentation for this config option
  
          :arg parser: the parser for converting this value to a Python object
  
          :arg meta: catch-all for other key/value pairs you want to association
              with this option
  
          """
          option = Option(key, default, alternate_keys, doc, parser, meta)
          self.options[key] = option